<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>取消请求</title>
</head>

<body>
    <button>点击发送</button>
    <button>点击取消</button>
    <script>
        //获取元素对象
        const btns = document.querySelectorAll('button');
        let x = null;

        btns[0].onclick = function() {
            x = new XMLHttpRequest();
            x.open("GET", 'http://127.0.0.1:8000/delay');
            x.send();
        }

        //abort 取消请求
        btns[1].onclick = function() {
            x.abort();
        }
    </script>
</body>

</html>